I am seriously considering the Arcam AVR300 receiver, principally for its audio capabilities. However, I'm a little concerned about the rated frequency response (20Hz - 20 Khz) for high resolution (sacd) sources. My Marantz sacd player, for instance, is rated from 2Hz to 50,000 Khz when in 'custom' mode. Does anyone have any views/experience on this? In particular, is it just the Arcam amplifier section that is limited or is it also the preamp section? Thanks.